Enhance scrollbar look and feel on Firefox

### Checklist

- [X] I have verified this is the correct repository for opening this issue.
- [X] I have verified no other issues exist related to my request.

### Is Your Feature Request Related To A Problem? Please describe.

Choco-theme does not customize scrollbars on Firefox, but does on chromium based browsers.

### Describe The Solution. Why is it needed?

We should look to see if we can customize the scrollbars at least a little bit. They are not as customizable as Chromium based browsers, but we may be able to make them look a little bit better. See https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_scrollbars_styling

### Additional Context

_No response_

### Related Issues

_No response_